Press for cutting cardboard and scrap ejector therefor



H. BOBST May 16, 1939.

PRESS FOR CUTTING CARDBOARD AND SCRAP EJEGTQR THEREFOR Filed Nov. 9, 1957 INVENTOR= HENRI Boas-r 5 QZ/ZUQ Z y ATTORNE/KS Patented May 16, 1939 UNITED STATES PATENT OFFICE PRESS FOE CUTTING CARDBOARD AND SCRAP EJ'ECTOR THEREFOR Henri Bobst, Lausanne, Switzerland 11 Claims.

This invention relates to a press for cutting cardboard by means of steel punches and provided with a scrap-ejector.

It is characterized by the fact that the ejection is elfected by drawing along the scrap pieces by means of at least one needle which projects from a drum. and which penetrates into the scrap pieces, the drum rotating during this operation at a peripheric speed which is substantially equal to the moving speed of the cardboard against which same is applied.

The accompanying drawing shows an embodiment of the press according to the invention and given by way of example.

Figs. 1 and 2 are side views of said embodiment, with the members of the scrap-ejector occupying different positions.

Fig. 3 is a plan View of part of this device.

As will be seen, a web of cardboard 1 passes through the press which consists of the frame 2 and of a movable head 3, of which the under surface carries the steel punches. The web of cardboard advances in jerks, for it stops for each cutting operation and moves forward between said operations. This movement is effected by the balancing of a sector 4 which acts on a toothed wheel 5, which in its turn draws along a transporting drum by means of a pawl 6. The to and fro movement of the sector is controlled by a connecting rod 1, one end of which is connected to an eccentric 8 actuating the press. The direction of rotation is given by the arrow 9 and the angle of balance of the sector 4 can be modified by moving the fixing point of the 5 connecting rod I along a groove Iii. The moving direction of the sector is indicated by an arrow in each of the figures. The displacement indicated in Fig. 1 corresponds to the drawing along of the web in the direction of the arrow 49 II' and it will be seen that at this moment the head 3 of the press is raised, thus leaving a free passage for the cardboard. The moving direc" tion of the sector shown in Fig. 2 constitutes an idle backward movement, that is to say without 5 there being any drawing along of the web which is at this moment subjected to a cutting operation.

A second toothed wheel I! is geared to the sector and by means of a pulley and chain I3 0 drives a drum l4 carrying a needle Hi. This drum is placed under the web, when the latter leaves the press and the needle is so placed that it can be driven into the scrap to be ejected. Now this is how the ejection operation is effected:

Due to its meshing with the sector 4, the toothed wheel l2 and consequently the drum i l efiect an alternative rotating movement. By a correct arrangement of these different members and by foreseeing the consequent transmission relations, it is possible to get the drum which is applied against the web in the manner shown in Fig. 1, to turn at a peripheral speed which is always substantially equal to the rate of advance of the cardboard and this because of the positive connection between said two movements. From this moment, if the position of the needle i5 is so adjusted as to prick into the scrap 16, the latter is necessarily removed from the web, without there being any pullings or tearings, since there is no sliding between the drum l4 and the web I. "This arrangement has further the advantage of always ensuring the manner of operation just described, since for every variation in the quantity of cardboard advanced there always corresponds an equivalent variation in the angle of rotation of the drum. M, for both these movements together depend on the angle described by the sector 4.

It is however necessary to prevent the needle i5 from pricking into the cardboard during the return movement of the drum. l4 shown in Fig. 2. For this purpose, the head'3 carries a cam. H, which acts by means of a cranked lever it in such a manner as to lower the drum Hi against the action of a spring 26 connected to frame 2 and tending normally to hold the lever and thereby also the drum in raised position during at least part of the return movement of the latter, which is effected during the cutting operation, that is to say when the head 3 is in the neighborhood of its lower dead centre, for which reason the cam H can be carried by said head. A lever I!) having a fixed axis at 25 and carrying an eccentric engaging the arm l8 also makes it possible to cause the drum 14 to be lowered at any time while in operation, for instance to regulate the machine by rotating the lever Hi to lower arm l8.

Finally, toremove the scrap fixed to the needle,

two scrapers 20, 2| are provided, of which the first 20 serves to remove a scrap which has not been removed by the scraper 2!, a circumstance due to the cardboard not having advanced far enough forward to transmit to the drum M a sufiicient forward movement for the needle to reach the scraper 2|. The backward movement is in fact always sufficient to catch the scrap in the scraper 20.

At 22 is a grooved friction wheel which applies the cardboard against the drum while the needle is seizing the scrap, the groove of said wheel permitting the passage of the needle. It is clear that instead of one needle, use could be made of several needles which would all act for instance one after another to remove the scrap succeeding each other in the advancing direction of the cardboard, or placed side by side to remove simultaneously several scraps resulting from cutting operations effected one beside the other.

The press can also comprise cutters 23 for cut ting the web of cardboard into pieces, for instance for the manufacture of boxes. There could also be added a printinggroup for printing these pieces.

What I claim is: I V

1. A press for cutting cardboard comprising a support over which a web of cardboard may be advanced, means for intermittently advancing said cardboard over said support, a movable head carrying a punch and cooperating with said support for cutting the cardboard while said cardboard web is at rest, a rotatable drum, means for alternately rotatingsaid drum in clockwise and anticlockwise direction, said drum'carrying on its periphery at least one impaling pin for impaling and removing the cardboard scrap from said web while said drum is rotating in one direction, said drum rotating during this operation at a peripheral speed which is substantially equal to the moving speed of the cardboard web.

2. A press for cutting cardboard comprising a support over which a web of cardboard may be advanced, means for intermittently advancing said cardboard over said support, a vertically movable head carrying a punch and cooperating with said support for cutting the cardboard while said cardboard web is at rest, means for efiecting positive vertical movement of said head, a rotatable drum, means for alternately rotating said drum in clockwise and anticlockwise direction, said drumcarrying on its periphery at least one impaling pin for impaling and removing the cardboard scrap from said web while said drum is rotating in one direction, said drum rotating during this operation at a peripheral speed which is substantially equal to the moving speed of the cardboard web.

3. A press for cutting cardboard comprising a support over which a web of cardboard may be advanced, means for intermittently advancing said cardboard over said support, a movable head carrying a punch and cooperating with said support for cutting the cardboard while said cardboard web is at rest, a rotatable drum, means for alternately rotating said drum in clockwise and anticlockwise direction at a peripheral speed substantially equal to the moving speed of the cardboard web, at least one impaling pin projecting from the periphery of said drum for impaling and removing the cardboard scrap from said web during rotation of said drum in one direction, the movement of said drum in the opposite direction bringing said drum back to its starting position, and means for removing said drum from the cardboard web during at least part of the backward movement of said drum.

4. A pass for cutting cardboard comprising a support over which a web of cardboard may be advanced, means for intermittently advancing said cardboard over said sup-port, a vertically movable head carrying a punch and cooperating with said support for cutting the cardboard while said cardboard web is at rest, means for effecting positive vertical movement of said head, a rotatable drum, means for alternately rotating said drum in clockwise and anticlockwise direction at a peripheral speed substantially equal to the moving speed of the cardboard web, at least one impaling pin projecting from the periphery of said drum for impaling and removing the cardboard scrap from said web during rotation of said drum in one direction, the movement of said drum in the opposite direction bringing said drum back to its starting position, and means cooperating with the downward vertical movement of said press head for positively removing said drum from the cardboard web during at least part of the backward movement ing said cardboard over said support, a vertically movable head carrying a punch and cooperating with said support for cutting the cardboard while said cardboard web is at rest, means for effecting positive vertical movement of said head, a rotatable drum, means for alternately rotating said drum in clockwise and anticlockwise direction at a peripheral speed substantially equal to the moving speed of the cardboard web, at least one impaling pin projecting from the periphery of said drum for impaling and removing the cardboard scrap from said web during rotation of said drum in one direction, the movement of said drum in the opposite direction bringing said drum back to is starting position, said vertically moveable head having a cam cooperating with a member connected to said drum whereby downward movement of said head removes said drum from said cardboard web.

6. A press for cutting cardboard comprising a support over which a web of cardboard may be advanced, means for intermittently advancing said cardboard over said support, a moveable head carrying a punch and cooperating with said support for cutting the cardboard while said cardboard web is at rest, a rotatable drum means for alternately rotating said drum in clockwise and anticlockwise direction at a peripheral speed substantially equal to the moving speed of the cardboard web, at least one impaling pin projecting from the periphery of said drum for impaling and removing the cardboard scrap from said web during rotation of said drum in one direction, the movement of said drum in the opposite direction bringing said drum back to its starting position, and means for removing said drum from the cardboard web during at least part of the backward movement of said drum, two scrapers being provided adjacent said drum for removing scrap from said impaling pin, one of said scrapers acting while said drum rotates'in one direction and the other scraper acting while said drum rotates in the opposite direction.

7. A press for cutting cardboard comprising a I said drum for impaling and removing the cardboard scrap from said web during rotation of said drum in one direction the movement of said drum in the opposite direction bringing said drum back to its starting position, and means cooperating with the downward vertical movement of said press head for positively removing said drum from the cardboard web during at least part of the backward movement of said drum, and supplementary means for removing said drum from said cardboard web independently of the movement of the press head.

8. A press for cutting cardboard comprising a support over which a web of cardboard may be advanced, means for intermittently advancing said cardboard over said support, a vertically movable head carrying a punch and cooperating with said support for cutting the cardboard while said cardboard web is at rest, means for effecting positive vertical movement of said head, said means comprising means for connecting said head to a rotating eccentric, and means connecting said eccentric to a positively driven oscillating means, whereby oscillating action of said oscillating means causes rotation of said eccentric and vertical movement of said head, a rotatable drum, means for alternately rotating said drum in clockwise and anticlockwise direction, said drum carrying on its periphery at least one impaling pin for impaling and removing the cardboard scrap from said Web while said drum is rotating in one direction, said drum rotating during this operation at a peripheral speed which is substantially equal to the moving speed of the cardboard web.

9. A press for cutting cardboard comprising a support over which a Web of cardboard may be advanced, means for intermittently advancing said cardboard over said support, said means comprising a positively driven oscillating member, rotating advancing means engaging said cardboard web, and also engaging said oscillating member, and means for causing rotation of said advancing means in one direction to advance said web during movement in one direction of said oscillating member and to prevent rotation of said advancing means during movement of said oscillating member in the opposite direction, a movable head carrying a punch and cooperating with said support for cutting the cardboard while said cardboard web is at rest, a rotatable drum, means for alternately rotating said drum in clockwise and anticlockwise direction, said drum carrying on its periphery at least one impaling pin for impaling and removing the cardboard scrap from said web while said drum is rotating in one direction, said drum rotating during this operation at a peripheral speed which is substantially equal to the moving speed of the cardboard web.

10. A press for cutting cardboard comprising a support over which a web of cardboard may be advanced, means for intermittently advancing said cardboard over said support, said means comprising a positively driven oscillating means, rotating advancing means engaging said cardboard web and also engaging said oscillating means, and means for causing rotation of said advancing means in one direction to advance said Web during movement in one direction of said oscillating member and to prevent rotation of said advancing means during movement of said oscillating member in the opposite direction, a vertically movable head carrying a punch and cooperating with said support for cutting the cardboard While said cardboard Web is at rest, means for effecting positive vertical movement of said head, means for connecting said head to a rotating eccentric, and means connecting said eccentric to said oscillating means, whereby oscillating action of said oscillating means causes rotation of said eccentric and vertical movement of said head, the oscillating means thereby positively controlling both the intermittent movement of the web and the vertical movement of the head.

11. A press for cutting cardboard comprising a support over which a web of cardboard may be advanced, means for intermittently advancing said cardboard over said support, said means comprising a positively driven oscillating means, rotating advancing means engaging said cardboard web and also engaging said oscillating means, and means for causing rotation of said advancing means in one direction to advance said Web during movement in one direction of said oscillating means and to prevent rotation of said advancing means during movement of said oscillating means in the opposite direction, a movable head carrying a punch and cooperating with said support for cutting the cardboard while said cardboard web is at rest, a rotatable drum means for alternately rotating said drum in clockwise and anticlockwise direction, said drum carrying on its periphery at least one impaling pin for impaling and removing the cardboard scrap from said web while said drum is rotating in one direction, said drum rotating during this operation at a peripheral speed which is substantially equal to the moving speed of the cardboard web, and means connecting said drum rotating means with said oscillating means said connecting means comprising pulley means, toothed means engaging said oscillating means with said pulley means, means connecting said pulley means to said rotatable drum, the oscillating means thereby positively controlling both the alternative rotating movement of such drum and intermittent movement of said web.

HENRI BOBS'I'. 

